Trivia: In the scene where Conan is wrapped in a blanket and being painted to ward of the spirits, Arnold Schwarzenegger actually fell asleep while filming this.
Trivia: Arnold Schwarzenegger did his own stunts, as a believable stunt double could not be found.
Trivia: Arnold's buddy from his bodybuilding days, Franco Colombo, appears in many of his films. In this film he appears at the very beginning, as part of the army that attacks Conan's village and kills his parents. He is the advance scout who crouches atop a rock as the rest of the army sweeps by him.
Trivia: Kiyoshi Yamazaki who was the instructor of Arnie, Sandahl Bergman and Gerry Lopez makes a cameo as the Conan fighting instructor.
Trivia: William Smith who plays the father of Conan was also a bodybuilder and was offered the opportunity to play the role of Conan but refused.
Answer: Like an Army Drill Sargent, he was berating them for not doing it better. Toughening them to become the best they could be.
Also, the other student laughs at Conan's punishment, so the teacher kicks him to teach him some humility.